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ZX-7FB15FD7212024年12月B卷 · 第 15 题
2024年12月B卷 · 原库模块 2 · Q15 原库参考解析
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- 2024年12月B卷 · 原库模块 2 · Q15
- 2025年10月国际B卷 · 原库模块 2 · Q20
A research manager selected 2 random samples of ovens of a certain type to estimate the average amount of time this type of oven takes to preheat to 325 degrees Fahrenheit (°F). The research manager recorded the amount of time, in minutes, each oven takes to preheat to 325 °F. Based on the first sample, the research manager estimated that this type of oven takes an average of 15.2 minutes to preheat to 325 °F, with an associated margin of error of 1 minute. Based on the second sample, the research manager estimated that this type of oven takes an average of 15.4 minutes to preheat to 325 °F, with an associated margin of error of 2.2 minutes. Assuming the margins of error were calculated the same way, which of the following best explains why the first sample obtained a smaller margin of error than the second sample?
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